FuzzDog FuzzPup Solar Face Operating instructions

Brand: FuzzDog

Model: FuzzPup Solar Face

Type: Operating instructions

Solar Face

Si or Ge Fuzz Face with

a magic bias dial

Contents of this document are ©2022 Pedal Parts Ltd.

No reproduction permitted without the express written

permission of Pedal Parts Ltd. All rights reserved.

FuzzPup

IMPORTANT

Before you start...

Grab the general build doc that covers all FuzzPup V2 builds.

Most of the information you need for this build is in there.

Read it? OK, carry on.

Schematic + BOM

This is the full schematic including the following optional parts:

Voltage Inverter (D1, IC1, C6, C8) to make a positive ground build (using PNP

transistors) work with standard negative ground supplies.

To use the voltage inverter simply add these parts. You also need to jumper the

pads marked J2 on the back of the PCB with a blob of solder. You can use a 7660

or MAX1044.

If you’re building a NPN / negative ground circuit, so don’t require the inverter,

leave these parts out and jumper the two pads marked as J1 on the back of the

PCB with a blob of solder.

Smoothing Caps (C4, C5) to prevent high frequency oscillation on builds with

higher gain silicon transistors. These aren’t required on builds using germanium

transistors in the standard Fuzz Face gain ranges.

Schematic + BOM PNP/Ge

R1 100K

R2 33K

R3 470R

C1 1u elec

C2 10n

C3 22u elec

C4 Empty

C5 Empty

C6 10u elec

C7 22u elec*

C8 10u elec

D1 1N4148

D2 1N4001

IC1 TL7660SEPA

Q1-2** Ge Fuzz Face set

BIAS 5KB

FUZZ 1KC

VOL 250KA

T1 47-50K

T2 10K

Parts listed in green are the optional

voltage inverter. If you’re not adding this

leave these out and connect the J1 pads

on the back of the board as detailed on

the previous page with a blob of solder.

You’ll have to wire it as positive ground if

you’re using PNP transistors and aren’t

using the inverter.

*This is the largest value we

could find that is short enough

to physically fit into the build.

Use 10u if your 22u are too big.

**Typical transistor gain values

for a Fuzz Face are:

Q1 - 70ish

Q2 - 120ish

Schematic + BOM NPN/Si

R1 100K

R2 33K

R3 470R

C1 1u elec***

C2 10n

C3 22u elec***

C4 *

C5 *

C6 Empty

C7 22u elec‡

C8 Empty

D1 Empty

D2 1N4001

IC1 Empty

Q1-2** BC108 etc

BIAS 5KB

FUZZ 1KC

VOL 250KA

T1 47-50K

T2 10K

*You should use small value ceramic caps for

C4-5. The larger the value the more

top-end will be removed from the signal.

We go for C4 - 470p, C5 100p

**Feel free to try any low-medium gain BJT

transistors.

***Reverse C1 and C3 for this configuration.

‡This is the largest value we could find that is

short enough to physically fit into the build. Use

10u if your 22u are too big.

Don’t forget to jumper the J1 pads.

This configuration will

also work for NPN

Germanium transistors,

but you won’t need C4-5.

PCB layout ©2022 FuzzDog

FuzzDog.co.uk

Everything else you need is in the

general build doc you’ve already read.

Head back to that.

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FuzzDog FuzzPup Solar Face Operating instructions

Brand: FuzzDog

Model: FuzzPup Solar Face

Type: Operating instructions

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